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So its mainly three things accounts receivable, inventory and payables.

Accounts receivable is revenue not yet received. So if receivables increase from FY16 $50m to $100m then this is a cash outflow (negative impact) as a sale has not actually been received as cash and booked as an increase in receivables. It also may never be received if that account goes bad i.e. impaired.

Payables are money that Vocus owes to suppliers. So if in FY16 payables goes from $25m to FY17 of $50m. This is a cash inflow as it was a delayed payment.

Inventory doesn't matter as they dont sell goods.

In generally an increase from year 0 to year 1 for assets is cash out and vice versa.
And if an increase from year 0 to 1 for liabilities is a cash inflow and vice versa.

So its not actually cash in a bank account but delayed payments from customers or to suppliers. This affects cashflow due to the finance cycle. If debtor days (receivables) are greater than creditor days (payables) then the company needs to source cash (a loan) to finance the delay in payments.